534 FTP Reply Code - KB Article #1537

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Example Reply
534 Request denied for policy reasons.

Synopsis
A 534 reply code may be issued in response to any command that the server is unwilling to process due to its security policy. It is a permanent negative reply, which means the client is discouraged from sending the command again since the server will respond with the same reply code. It usually means that the server requires a certain level of security to exist on the connection before processing the command or that it is unwilling to process a command that would provide for decreased security.